Superconductivity in high-pressure synthesized pure and doped MgB2 compounds

Details Superconductivity in high-pressure synthesized pure and doped MgB2 compounds Superconductivity in high-pressure synthesized pure and doped MgB2 compounds

2002-06-21

arxiv.org/abs/cond-mat/0206409v1

Physics

Condensed Matter

Superconductivity

21 pages, 7 figures, submitted to Journal of Superconductivity (Proceedings SCRM 2002)

Scientific paper

Dense pure and doped (Mg1-xAx)B2 samples with A = Na, Ca, Cu, Ag, Zn and Al were synthesized at high pressure - high temperature in a multi anvils press (3.5-6 GPa, 900-1000C) for x up to 0.20. They were studied by x-ray diffraction, scanning electron microscopy and their superconducting properties were investigated by a.c. susceptibility, magnetization and transport measurements. Only Al is really substituted on the Mg site. The others elements form secondary phases with B or Mg. No large effect is observed on the superconducting properties Tc, jc critical current, Hirr and Hc2.

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